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    • 8. 发明授权
    • Arrayed wave division multiplex to extend range of IOFDR fiber bragg sensing system
    • 阵列波分复用以扩展IOFDR光纤布拉格传感系统的范围
    • US09404831B2
    • 2016-08-02
    • US14524714
    • 2014-10-27
    • Alexander M. BarryKarl Kai KuIan MitchellWilliam Johnston
    • Alexander M. BarryKarl Kai KuIan MitchellWilliam Johnston
    • G01M11/00G02B6/12G01V8/16G01K11/32
    • G01K11/3206G01H9/004G01L1/246G01V2210/1429
    • An apparatus for performing a measurement of a downhole property includes an optical fiber having a first section that has a first set of fiber Bragg gratings with a first resonant wavelength inscribed therein and a second section that has a second set of fiber Bragg gratings with a second resonant wavelength different from the first resonant wavelength inscribed therein. The second section is in series with the first section. An optical interrogator emits a swept-wavelength frequency domain light signal having varying wavelength amplitude modulation into the optical fiber, receives a frequency domain return light signal, and transforms the frequency domain return signal into a time domain to determine a resonant wavelength shift of each fiber Bragg grating and the corresponding location of each interrogated fiber Bragg grating. A processor converts the resonant wavelength shift of each interrogated fiber Bragg grating into the downhole property measurement.
    • 用于执行井下性质的测量的装置包括具有第一部分的光纤,该第一部分具有第一组光纤布拉格光栅,其具有内接第一共振波长的第一组光纤布拉格光栅,以及具有第二组光纤布拉格光栅的第二部分, 谐振波长不同于刻录在其中的第一谐振波长。 第二部分与第一部分串联。 光学询问器将具有变化的波长幅度调制的扫频波段频域光信号发射到光纤中,接收频域返回光信号,并将频域返回信号变换成时域以确定每个光纤的谐振波长偏移 布拉格光栅和每个询问光纤布拉格光栅的相应位置。 处理器将每个询问的光纤布拉格光栅的谐振波长偏移转换成井下性质测量。